拉RSS订阅来自Facebook页面 [英] Pull RSS Feeds From Facebook Page

问题描述

我需要帮助拉RSS提要，从一个Facebook页面，我用下面的代码，但它不断给我一个错误：

I need help to pull RSS feeds from a facebook page I'm using the following code but it keeps giving me an error :

string url = 
    "https://www.facebook.com/feeds/page.php?id=40796308305&format=rss20";

XmlReaderSettings settings = 
    new XmlReaderSettings
                    {
                         XmlResolver = null,
                         DtdProcessing=DtdProcessing.Parse,

                     }; 
XmlReader reader = XmlReader.Create(url,settings);

SyndicationFeed feed = SyndicationFeed.Load(reader);

foreach (var item in feed.Items)
{
    Console.WriteLine(item.Id);
    Console.WriteLine(item.Title.Text);
    Console.WriteLine(item.Summary.Text);

}

if (reader != null) reader.Close();

此代码工作完美地与任何博客或网页RSS，但与Facebook RSS它给人以下列异常消息

This code works perfectly with any blog or page rss but with Facebook rss it give an exception with the following message

一个名为HTML和命名空间http://www.w3.org/1999/xhtml的元素不是允许饲料格式。

The element with name 'html' and namespace 'http://www.w3.org/1999/xhtml' is not an allowed feed format.

感谢

推荐答案

Facebook将在这种情况下返回HTML，因为它不喜欢被XmlReader中提供的用户代理。既然你不能自定义它，你需要一个不同的解决方案，以抢进。这应该解决您的问题：

Facebook will return HTML in this instance because it doesn't like the User Agent supplied by XmlReader. Since you can't customize it, you will need a different solution to grab the feed. This should solve your problem:

var req = (HttpWebRequest)WebRequest.Create(url);
req.Method = "GET";
req.UserAgent = "Fiddler";

var rep = req.GetResponse();
var reader = XmlReader.Create(rep.GetResponseStream());

SyndicationFeed feed = SyndicationFeed.Load(reader);

这是严格的Facebook的行为，但建议的变更应该同样适合那些其他网站还好你当前的实现。

This is strictly a behavior of Facebook, but the proposed change should work equally well for other sites that are okay with your current implementation.

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